Large house sized object floating in mid-air near Portsmouth traffic circle.

Seen while driving on the highway in Portsmouth, near the traffic circle. Craft/object was extremely large (house size) floating in mid-air. Color could not be detected. No sounds were made. While passing under the craft, GPS froze and the 2 year old child in the car woke up and started crying. After a few seconds, object sped off in one direction (estimated 0-90 mph in 1-2 seconds)